Combination blanking and forming die.



C. C. ELSENER.

COMBINATION BLANKING AND FORMING DIE.

APPLICATION FILED MAI-110,191].

Patented July 2, 1918.

3 SHEETSSHEET l.

C. C. ELSENER.

COMBINATION BLANKING AND FORMLNG DIE.

V APPHCATION FILED MARL 20,1917- 1,@7@,3m

"25 Z f Z7 Patented July 3 M I l C. C. ELSENER.

COMBINATION BLANKING AND FORMING DIE.

APPLICATION FILED MAR 20. 1917.

-JPatented July 2, 1918.

3 SHEETS-SHEET 3.

it'll l to UHAMIIES C. ELSENJEE,

or wn'rnnnoo, town.

COMBINATION BLANKING AND FORMING- DIE.

newness.

To all whom it may concern."

Be it known that 1, CHARLES C. ELsENnR, a citizen of the United States,residing at lVaterloo, in the county of Blackhawk and State of Iowa,have invented certain new and useful Improvements in CombinationBlanking and Forming Dies, of which the following is a specification.

The invention has for an object to give a die construction especiallyuseful in the stamping of dishes from sheet metal, and has for an objectto enable the cutting of the blank and the forming of the dished portionin the blank in one operation. A special object of the invention is toenable the formation of such dishes economically, requiring less metalthan by the ordinary process. liability of wrinkling of the metal at thesides of the dished portion as frequently occurs under present methods.Another object is to enable the formation of a dish having a very thickedge portion adapted to give the dish ample rigidity, while enabling theformation of the intermediate parts of the plate of thinner material, inplaces where it is of such form that the thinner material thus exposedto withstand stresses incident to use.

It is a further object to enable the formation of a plate with heavyedge portions, adapted to give it sufficient rigidity, without requiringcrimping of the edges.

It is well understood that the surfaces where the principal wear occursin pie plates and other dishes, is on the bottom, and their upper rimand edge portions. By the action of my dies, it is possible to use ametal of ample thickness to sustain the wear ordinarily occurring intheparts mentioned, and to form a dish the bottom and upper rim portionsof which will be of a full thickness, while the sides or slopingportions intermediately thereof will be of greatly attenuated material,which owing to conical or other forms customarily foun in the slopingparts of dishes will be amply strong to resist the stresses to which itwill be subjected, and being subject to much less abrasion than theother parts, will wear and last equally long.

Specification of Letters Patent.

Application filed March 20, 1917.

A further object is to obviate the Patented duly this.

Serial No. 1569M.

Objects and advantages, and features of invention in addition to thosementioned will appear from the construction, arrangement, andcombination of parts hereinafter described and shown in the drawings,wherein,

Figure 1 is a sectional view of an appliance constructed in accordancewith my invention, in position to receive stock.

Fig. 2 is a similar view showing the device in position immediatelyafter the cutting of a blank and its initial forming operation,

Fig. 3 is a similar view in ing position,

Fig. 4 is an illustration of the work in the form produced in Fig. 2,

Fig. 5 is a similar view of the work resulting by the operationillustrated in Fig. 3,

Fig. 6 is a top view of the upper die,

Fig. 7 is a similar view of the lower die.

, There is illustrated a metal cutting and forming appliance adapted forthe cutting of a blank and the forming thereof in one operation, adaptedto be used with some of the familiar forms of presses, either of thetoggle, cam, or hydraulic type well known in the art. As the manner ofusing the appliance with such presses will be readily understood withoutdetailed disclosures, the press construction is omitted.

the final form In the present instance, a device adapted to use informing pie plates is illustrated, by similar constructlon with slightmodificaing pans of various kinds. cludes a lower die comprising a basepiece 10 of suitable steel, in which pilot pins' 11 are mounted forguiding the upper die to be subsequently described, and upon which aforming and blanking ring 12 is mounted, the latter being formed ofsuitable hard steel. The base piece 10 is formed with a central recess13, the sides of which are shaped to conform to the shape of the articleto be formed, and forming a continuation of the inner face of the ring12, the sides of the recess 13 and the inner side of the ring 12' beingin the present instance in the form of an inverted truncated cone. Thebase has a large central opening 14 therelllti tions of form it may beutilized in produc-v The device inthrough, communicating with the recess13. Around the recess 13 a slight boss 15 is formed, and the formingring 12 is formed with a suitable angular concentric recess on the underside to fit over the boss 15, as illustrated. The ring 12 is secured inplace by filester cap screws 16, suitably engaged in the base 10. Astripper plate 17 is provided, adapted to fit closely around the ring12, and supported by sliding bolts 18, mounted vertically in the base10, which has suitable recesses formed therein to receive the boltssnugly, springs 19 being confined in the recesses beneath the bolts asshown. The bolts 18 have each a longitudinally extended recess portion20, extending for a suitable distance on the bolt, and proper set screws21 are engaged through the sides of the base 10 to project into therecesses 20, serving to limit outward movement of the bolts 18. Theupper elements of the device include an annular blank holder 22,vertically movable, and receiving the pins 11 slidably therethrough, asshown, being suitably formed for the purpose. Centrally through thisholder there is vertically reciprocable a punch element 23, having itslower portion. tapered for a distance to correspond to the slope of thesides of the recess 13 its lower end portion stopping short of the baseof the recess 13 when fully projected into the base piece 10, and itslarger part having a diameter slightly less than the minimum insidediameter of the ring 12. Upon the blank holder 22 there is carried ablanking ring 24, adapted to cooperate with the ring 12 in cutting theblank for an article to be formed. Immediately inward of and tightlyfitted within the ring 24, there is an upper forming ring 25, these tworings being suitably secured to the blank holder 22 by means of screws26. The member 22 is formed with a suitable flange 27 closelycircumscribing the ring 24, whereby the upper blanking ring is suitablytrussed and reinforced. The ring 25 is formed with an opening just largeenough to permit the passage of the punch 23, and has an outerhorizontal face 28, disposed to engage snugly upon the upper side of thering 12, which has a corresponding opposed surface. The ring 25 isformed with an inner downward extension or forming flange 29, having thesame inclination at the outer sides as the inner surface of the ring 12,as shown. The maximum outer diameter of the flange 29 should be slightlyless than the maximumv inner diameter of the ring 12, as will be readilyunderstood, the difference corresponding to the thickness of metal to beformed.

The punch 23 and blank holder 22 are connected with the press elementsso that the blank holder may move into snug coiiperative relation to thelower die before the punch operates, and in withdrawal the punch is tobe lifted above the level of the lower'side of the blanking ring 24.

It is notable that the blanking ring 24 is of a vertical measurementslightly greater than the distance between the top of the ring 25 andthe lower part of the forming flange 29, so that the cutting of theblank occurs before the initial forming operation begins. The set screws21 are so positioned as to check upward movement of the stripper plateas soon as it reaches or passes slightly above the level of the upperside of the rin 12. The mounting of the blank holder 22 is such that itwill move downwardly a sufficient distance to firmly compress and holdthe outer edge portion of a blank against the upper face of the ring 12.

In operation, a straight sheet cut the proper width may be enteredbetween the dies, while the punch 23 and the blank holder 22 are at theupper limit of their movement, and as the blank holder 22 descends therings 24 and 12 first cut the blank to the necessary size, andimmediately thereafter the flange 29 depresses the body of the blank atits intermediate part closely adjacent the line at which the sides ofthe vessel being formed join the rim portion, the edge portion of theblank being slightly drawn inwardly thereby and bent over the ring 12;and as the surface 28 engages upon the blank to hold it flat, a slightdistention of the metal adjacent the lower part of the flange 29 occurs,so that at the inner edge of the rim a maximum thickness of metal isprovided. The edge portion of the blank and inclined portion between theflange 29 and ring 12 are finally clamped firmly between the upper andlower forming rings and the punch 23 then descends, bearing downwardlythe central part of the blank and distending the metal between thebottom of the punch and the lower edge of the flange 29, the tendency ofthe metal to wrinkle being oflset by its longitudinal strain, so that aperfectly smooth side portion is formed, at the same time that it isdistended. The maximum thickness of the blank is thus retained upon thebottom where most required to resist abrasion in use of the article. Theextreme edge portion of the plate may be crimped if desired, in anycustomary manner, although not essential.

What is claimed:

In a device of the character described a die element having an outercutting edge therearound, an intermediate holding face and an innerforming face, a support therefor; a second die element comprising ablanking ring conforming to the cutting edge of the first die, a formingand holding element within and in fixed relation to the blanking ring,having a face adapted to coengage snugly upon a blank with the upperside of the first die element to hold the blank neinnee against invverdlsiip, an inner downward enitciining nnii holding etw When pitcjecteditension on snid forming and heilciing elethenethnengh es described.

ment adapted to coiiperate with the forming In testimony whereof i haveshined my face of the first named member, and having signature inpresence of two Witnesses.

h an epening therethi'cugh, and e punch elev GHARLEh U. ELSJENERQ menthaving forming surfaces thereon cen- Witnesses: w tain of which form atcontinuetien of the Q. J. Vnmmmm forming surface of said extension onthe A. L. Snnnescnr.

